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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430b96831b147b2d5499e67ec2ae5f7b514bbd71e6a03c3f49a80e5a11257a96' 
  AND token = 'J1cizmmf5ma45RAGKIQEbAiOuvgChwfIF/bog9MtJtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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