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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c92e578e83f9239c99e33095e14296c20436141afd32c445602c8f27386d2d' 
  AND token = 'ELKsH/HZm5btEoOutNI3uFKPSTYjUbq+di2Ja2O7trI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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