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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f70ec1aa0d278e3c2cee4cffc964d10dff1f83e4a99672f2da32eea2a5d55e' 
  AND token = 'AEu7nIMRd0JaRoTCUVgMPcHCGRqPJ1lvId/J+kvcasM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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