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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40f1f8fa89f19d6a4257a5b99f8468c82f1bbd7d7da34f150de4f6ba1046aba' 
  AND token = 'Rk9kCL+yw2yW2V3EGPMx3l2aJyB8fvDeBdLvBaRVaaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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