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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9b46d946f0f796a139d6d641f6aaafedd4c9c051d0d895366b491545be5773' 
  AND token = '0UWnZoQvpAYhpvRt/B4QCeNpZXbgT/eTujXDPJGojaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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