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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a8599d359b87374f262354b7a6b5f6232309c4ee67d7e2b0de1e7e5da80402' 
  AND token = 'geyjqZ8NpQqZbMlRXt9Cyqr593b9L104cXrEEGlxCKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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