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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638bfdd3ad10b32b5d267846a2cd68d88c7a159b4b143b6f75a83d8e343d13bc' 
  AND token = '5I8FgmkZlNiLudA09MGsGS6Dxe6fK+Uz5jLE5m0iiLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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