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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920c36c8bf1be8932c360ab467e6bbb282db438defbd9fe0ce46d246c99bc784' 
  AND token = 'islKKEJ5jIelGTdUZ+95jMAj0pgVabG/JK2JFf3OB0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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