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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f015887f91660b86e0af88bf9d0dfde982be9c3620b59f4dfe7b9e39748054' 
  AND token = 'Xb9W1t9IEfhGFuZrg6I4fJMrQHKD8JPTUXOeF63nrmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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