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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883609a9da626fc454469d3c95e75b1bc6aa583856b044371f41af7192ca2c73' 
  AND token = 'cEAtOhQwKkWc9XDr0WC9Sz4AMxfEIgKJuubSYttuUFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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