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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84569ed86aeea9fb84f8ede35e11f729a637c183f935c8f7133a4e3f590c4f9' 
  AND token = 'zl/8HfZ0ZbiMWR/4UPCsae7pzq7SW9RMVScDMxssqqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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