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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7993d5c6b8057a30d6e640855e8bbc1d6632ea5672c55c5271b9f1ffd63cf5a7' 
  AND token = 'cwea0aBFHTXx7zxzLMLkqM3XSMKYhsYp33IYfVqKq+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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