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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60666e688533185d51f063c3b021c5993ca85ab20a4bfac7af10568df02c2389' 
  AND token = 'BCwKpMiZanF0HF/IXUt/Cr5UNzMDx++aNcRWAAvx+/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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