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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71d870c23c2c5309da8c3dd991bbb3523033e2cf7a837b79839156c0afe816' 
  AND token = 'cbfBkbe3uSN6H1EXV7DEfAg6BixsW73Lonq9eM59VX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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