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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5adda22b2a575d9fbac24176fb5e2be7af5150ecc34d7f0beb5d44954bf3a0' 
  AND token = 'F/fOvhp/d0ZBwUErrJa5fhPlNCh5fhIwPQuhJd/FSdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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