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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ae6df359e5e22cbe4345933b1e7a2f3989b78472e349b4c1ddb62952d09b08' 
  AND token = '/fl5LGr8FAddXeUe5y9rTfDOdH1jGJ1krv52CydyaKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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