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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2410d8fc75a2e903ff80745803074c33a4dc96372adccc0a91d1fb2cd65e1c3a' 
  AND token = 'Pdb3jRgT4H1zliZiMVrEWhnuagVEqlSGj66RoszaMbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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