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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb524b61d6570b92298506b917c35f7a4c5b9d451fbe9a3b576260d16b4332c' 
  AND token = 'MJTiyflz9mhY8VcwcTVEqE9xIA+SOcyXTHzgWQ7DvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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