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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e53e6174ed696b5307eebadd6f977b2e17b63567cf84e082b701c62caa1180d' 
  AND token = '8G6H9v6gP/ph7TThsepXPskEm8+3/Bjxo+IoELk2CtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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