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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec13ec738a1b006cb92ea9b02c6dd363a9f859c27e5e2d677f7a39743ddcb3bc' 
  AND token = 'gGaFvRHjf15gUxhv6z0ZaHjk1PQcU0hDyaNMMNjI7R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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