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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac32fc8440e869908481f238b8c71754580afe8992d974e5d60ad455e3df31c' 
  AND token = 'h3G7Wgy4BsuLGqr+vWcFMi2BpXgD+t+Wi9sKaoOO5HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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