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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfacd05c36530e8ded798d083d110078854af9981a62ee3c46ba2e61451e600' 
  AND token = 'WsFrCNQgVicL9db+FUQMuY8hWxbWSrfb2wT4tqlgXcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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