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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f7654bbaa45d20709f2e696098123db98608538b00d75b23c5edf7f8975a27' 
  AND token = 'lcld/l71H730DYcvVE61Um2YSUCyUHXQvd/df+B39jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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