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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f190e7a05d90b8c10922c8805cf25d5d7a1f25ea0f3a3736b7734b61d4c33f' 
  AND token = 'ijlxE6EYvk7yvXMgTPphE/J6SfEgATD8tErRF2lBMaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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