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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05ccbc6d86b31843bf5d91758eae3cf310a93b5cb780a434b8d0c42d93b1a21' 
  AND token = 'xlqY8rVfIB88uHl5ukMHcksZlAoxC4+5eK4ifJUHZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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