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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7508a933bc8e691530bb67c324d41567e492eb7c3aabe132e0f6a10bc8edad' 
  AND token = 'Q9A/xc54TG78BXJ19Od0fBvLKT4raOdkNY1jjuDzZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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