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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08d6e3a37a9ec1046c3511787d886eed0790975a954642cfb92aac12ce8f38a' 
  AND token = 'vbYXnc9kyhYp0OfmcLFJG/uskIXSHakYXAh2nTz0qyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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