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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8bc615b311f8ed460d6c523c340b0f56982e90e404003d2d7a2ab764eec8ef' 
  AND token = '7xEb6Ch1FVb1IfegdGPD1c5vVQhOxs+n9AAHIhV3BQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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