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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fd8974363f4adcfdc61260ec9a8012cea42766bcf62315e1c997998f91afb7' 
  AND token = 'pMkg3MuRboGAeyF5KgsATcYM5XtQLBSqL2hMaCu6zS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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