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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4672a76ffcd8793f55812a05f06c41b5c679d9850512cfa2dac7435511d9207' 
  AND token = 'dMvF5IZu0P1AKIkZqxMQwiKf/PB+I5At1S9ikWzNCF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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