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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5073f8b43cd8964ff89e7dee4186a8b865c76716d78c273eb36b36014b8310b' 
  AND token = 'J5vC7jJavOi6cQ6kkoic9GYTK4QvcgzQRkKtCAD9kws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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