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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091e144fe65b52682e6f6ea1f657ca6e95fa4067dfbc7ebbea4812e19f79f160' 
  AND token = 'xPjH+27r4vSU/SaBwiT7bIiPn3yoDeZIKinarTs6Ux8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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