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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e086e78add2a2172dc9aef7d35329030ab08e396df871d9244a0ccb7c8687ed9' 
  AND token = 'BGcaAp+IuT65q4lMiA4UIJGc1GcYid+nORw9OMLczwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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