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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f832d89693565c072f498f6d11f774acb86164a95b3ff07097ea3cc88e4c39de' 
  AND token = 'FCFajgheb2kbsY5n8A2gtOZOhcoeBuXCQ8Bx3UHZirw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}