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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0527fbfd445a945055b9ac882f8ffa5d68f25782b965cae429e50cd87025a404' 
  AND token = '96WtmI46X2dTrgR8XTpmzJ2mFfwjTTP9jzYd9NaaN28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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