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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc76034d5bc5d8422d0d7a858a79306b5cb37a9350a73e58772e6ae8b165908' 
  AND token = 'z/KiSxspckyHoewnjJ9350J8X4Frv3G5KP6Jz+v9XyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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