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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a83bb12879e9e1f5545fb9f284b22d8c85ad1b7cc6c5d2e509f48b14bed0fe' 
  AND token = '29hK2ojgX6a6U1/q42vdbIcdmx8WSJ5mlr4EM/ONXFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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