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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b667a227f6fcb521c00dd55b5e2732ade44f175da6fd26c9f2007e0a643c4aa6' 
  AND token = 'WWiU3TZV9KiRfQ6V0GhjpaNqEXwTEU2aDahvRVS4GAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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