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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4e86e5ce65edc7fce6508929adb0a6a22b2005eec62dd8339e4b609cd60166' 
  AND token = '3uVFOzOS94VpgvurdgdOFgRuhbYb/nlzBUmQYTcknyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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