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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08c5919b99d1d16bb4391805c0afae900256ae72093d22e77e1e9c7ab220ed4' 
  AND token = 'DGEBX3Fp7XAU44smkXOXQMwQy6DC8Zn59u0taR03YB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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