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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019ef9425027e39c53fc5201ec6faa78e8d8ab1acacede5f61267331503d4173' 
  AND token = '39bqQF3Pbz9zFz1X54cVE+Xjldlzsn70C0hhI406H8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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