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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb031e7bf7de4e2887b32454d9e4edb39bc2f84ea63476445ce855feb572dcb' 
  AND token = 'Tl47lP938Y5nXzby91Zc2Z1bOxCk2fhAYnm7loxBndA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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