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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fb883ec4c4d773cd5d7923d12d3f7f7dba5645b3a94f6d95c1e8f8c3a3bfec' 
  AND token = 'PkEfuxugrJ5Tj1KGoLXlP2uSqDE68qExmBthxdVylEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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