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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f125acf4dc4911620869ce9f4c32c3db42d13bdec578a64cc9a1a214d4b5111d' 
  AND token = '2ndZc68sf41iRdhKTk17b21ItLqJ/IGWoQCgATFY4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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