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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0049782458f0eba386ddc5e42f45343605cd4586b8b4defa5fc8106b6fb4bdc8' 
  AND token = 'XyzqsvPofgrM0C6mmASgs0Qa8oR9SW+TUsV4hfsWK5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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