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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d46bd129e4b008cad15a078bff1aa6808ccd503850dfd3cd98e70870de98d05' 
  AND token = 'aGRhEwyg5QhoJBbs1jofs3Mrq2Phh6CGU4eaPv+BU3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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