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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c4dc7e542e88f5fcaf74d8f66e297b5a4264d9c409c68e9c4f9db095dac824' 
  AND token = '2R9RlzGfKtUQTmE/FmSvdrDPZx6HNE+s5RRVoudfq90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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