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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25772fc6c906005dfeaaf85238374107b06add83d93fa10d0cf835ef69320ae3' 
  AND token = '6YsM4GyFpY7ZSxVlC97GxLOBTt2hlcp7rn+2diQuSfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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