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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6282440e1e5083c3612bf7eb14124b2b0337f87d5d70af2d11935a365c4297c' 
  AND token = 'R6GQEPQELExBqwLUl/YcSLd5pAYVt4PaEb8lq56xpFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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